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I love my old HP calculators, especially my 10C, 11C & 15C. However whenever I try to get the square root of a number on my 15C I get a Error $ message. How can I remedy this situation?

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  • brad504 Sep 27, 2009

    It was Error $ not error $. I also thought about resetting the 15C and agree with you that it could also take care of the constant user mode. By the term reset we are talking about pulling a battery for a short period and then replacing it right?

  • brad504 Sep 27, 2009

    Humm, I am trying to write error 4. Ok, well I did reboot the power by pulling a battery, but when I put it back in I am at the same situation being that the 'square root' and 1/x functions bring the error 4 message and it is still in user mode.........help?

  • brad504 Sep 28, 2009

    I appreciate all the input. I submit that the reason I am getting the ERROR 4 is that the calculator is in the USER mode. If I could get it out of USER mode, I think I would funciton properly?

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Don't worry I have more coming,

Error 4- You have 322 occupied program bytes and you try to load more program lines


Posted on Sep 26, 2009

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  • Richard Klein
    Richard Klein Sep 26, 2009

    Here's the site for a copy of the owners manual

    http://hp15c.org/hp15c.pdf

    I'll still be looking for Error $. Haven't found it yet. All errors are numbers except the power off error you stated. I look in more detail for you.


  • Richard Klein
    Richard Klein Sep 26, 2009

    I'm going back through the manual, I'm on pg 50 and haven't come across Error $. I think it is a system error that you are not suppose to get. However, I'm going to figure it out. If you have any more questions just respond on your posting here, and it will send me an email immediately.

  • Richard Klein
    Richard Klein Sep 26, 2009

    I think your right that you may have to reset. 1/x is only ref to matrix's so, I hope your not doing a illegal condition. Then again, I can't see how it could only be in ref to matrix's. I don't want to tell you to delete your memory, you probably done a lot of work to input the memory into the calculator system. I read the manual twice, pg 64 is missing. I'm really surprised it didn't give you an error 9, for fault in circuitry if system memory was at fault. But, it didn't so, I believe you should be ok to reset. That may allow you to get out of user mode too. Hope this helps. Like I said, "if you have any more question, just post a comment at this posting, and I'll respond immediately".

  • Richard Klein
    Richard Klein Sep 27, 2009

    Yes, reset is pulling the batteries for a period of time. I just wonder if the period of time is long enough for the capacitor to be completely discharged, and erasing all of the user memory. Error 4 is saying that apparently the user memory is still there, and when you use 1/x function it must be, or something is using some of the user and system memory to preform the function, and can't because, none is available. Error $ is a locked up system memory error telling you the calculator needs service repair by Hp. I was hoping to get rid of the system error by resetting the user memory allowing the calculator to resume the normal system functions. I thought that because, you didn't get a Error 9 which is a system board circuitry error but, apparently the Error $ takes more precedence.
    If the calculator is still in user memory then the reset did not work. Now, I was told to leave the batteries out for a day but, found that 4 hours worked but, that is on different devices too. Now, if you leave the batteries out for a day, and when you put them back in, and the calculator doesn't reset, I believe it is broken and needs servicing by HP. I am real sorry, I thought we would have a better out come, and we still might, if leaving the batteries out longer works to get the calculator to reset. That is the best I can do for you.


  • Richard Klein
    Richard Klein Sep 27, 2009

    If you go to the middle of this page at this site you will see in the hp 15c section a statement (available here), and click on to it, it will download a hp 15c simulator that operates just like your calculator on your computer. It is fast and easy to use. You do have to have WinZip on your computer to unzip the download. But once you have the folder unzip, just double click, hp 15c.exe and it will install the simulator. It stores it in the windows folder so, do a windows search for hp15c. The search will display all the hp 15c files and double click hp15c,exe again, and the simulated hp15c will appear on you computer.

    http://www.hpmuseum.org/simulate/simulat...

    I know this may not be what you want or even help you. I'm just trying to help.

    And I am also taking for granted that you use microsoft product installed on your computer too. But, it should work for apple also.




  • Richard Klein
    Richard Klein Sep 28, 2009

    Do a self test, as shown on pg 262 of the user manual. If the calculator passes then there's a good possibility that the (user/program) mode key is stuck, and if you can't free it, you need to get it serviced by hp. If the calculator fails the test then you need to get it serviced by hp.

  • Richard Klein
    Richard Klein Sep 28, 2009

    You have to be in program mode to delete programs but, being stuck in the user mode, if you could find a way to delete enough of anything such as non system variable it may free up enough memory to allow the system to run right. This is taking in to consideration that the user mode key isn't stuck, and the calculator doesn't need repair. I know your a real smart person, you would have to be to program this calculator. Resetting the programming only take you back to line 0000, and resetting the calculator by extended period of time by taking out the batteries had to of erased all the program memory. That is why I believe the calculator is in need of repair. This calculator if not in heavy use can function for a month on low battery power. You may have to go a full day with the batteries out, in order to get it to do a system reset.

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